Ive noticed something sad

I wanted to share my thoughts about the 40mm Pancake:

I would love to see another pancake lens in the EF lineup, but theres something which made me a bit sad because that wouldnt be possible (i think)

The sensor plane is about 40mm away from the lens' plane, which makes the focal length of the 40mm 2.8. That way you can make a very short lens.

Lets say if we want a wider lens as a pancake, it wont be possible because of retrofocus which comes onto that size. If we want a longer focal length, we still get a bigger lens so its not a pancake anymore.

Now how can a 62mm pancake lens or a 21mm pancake lens of pentax work?

There are wider pancake lenses that can natively fit on EOS mount, they just suck horribly in terms of optics, like the Voigtlander Color Skopar 20mm.

unless you have a background in designing lenses, i'd stop thinking about it...

DreDaze wrote in post #16254222
unless you have a background in designing lenses, i'd stop thinking about it...

LOL! Word

BrickR wrote in post #16254232
LOL! Word

+1. I agree

As mentioned, Voigtlander has the 20mm. And they also now make a 28mm too. All three voigtlanders are roughly the same size.

davidfarina wrote in post #16252660
I wanted to share my thoughts about the 40mm Pancake:

I would love to see another pancake lens in the EF lineup, but theres something which made me a bit sad because that wouldnt be possible (i think)

The sensor plane is about 40mm away from the lens' plane, which makes the focal length of the 40mm 2.8. That way you can make a very short lens.

Lets say if we want a wider lens as a pancake, it wont be possible because of retrofocus which comes onto that size. If we want a longer focal length, we still get a bigger lens so its not a pancake anymore.

Now how can a 62mm pancake lens or a 21mm pancake lens of pentax work?

Pentax probably has a different mount distance. I have seen some tiny wider ones for Canon though, not sure if you can pull them off at high quality or not.

wombatHorror wrote in post #16255074
Pentax probably has a different mount distance. I have seen some tiny wider ones for Canon though, not sure if you can pull them off at high quality or not.

Dont think its much different. I think theyve built it in a retrofocus design and still keeping the tinyness.